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Building & implementation Concern & critique Research & technical analysis
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Multiple readings Summary of METR's predeployment evaluation of GPT-5.6 Sol Concern & critique · 3 attributable reactions
Showing signals surfaced by Tim Duffy ×
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Established Evaluation & benchmarks Development 13d ago
⚡ 455 h early
OpenAI limits GPT-5.6 rollout government request

Summary of METR's predeployment evaluation of GPT-5.6 Sol

5 experts across 5 network communities independently surfaced this.

Why this matches Concern & critique reaction 1 attributable expert contribution · Tim Kellogg
“this is crazy. METR couldn’t measure the task time horizons of GPT-5.6-Sol because it kept hacking the test harness ..with actual exploits metr.org/blog/2026-06...” evidence ↗
5 experts 5 communities 1 sources clustered
Ted Underwood Ramon Astudillo Tim Kellogg METR Tim Duffy
How the network is reacting Experts are approaching this through 3 distinct lenses.
Multiple readings

Concern & critique

1 expert

Risks, limits and unintended consequences.

“this is crazy. METR couldn’t measure the task time horizons of GPT-5.6-Sol because it kept hacking the test harness ..with actual exploits metr.org/blog/2026-06...”

Building & implementation

1 expert

How teams are shipping and applying it.

“You can find additional information about our pre-deployment evaluation of GPT-5.6 Sol on our website: metr.org/blog/2026-06...”

Research & technical analysis

1 expert

Evidence, methods and technical implications.

“In their testing of GPT-5.6 Sol, METR found that it cheated a lot. If you've used it much for coding, have you encountered anything similar, or is the cheating mostly limited to cases it realizes it's in an eval? metr.org/blog/2026-06...”

2 experts discussed this · 6 posts
Tim Kellogg: this is crazy. METR couldn’t measure the task time horizons of GPT-5.6-Sol because it kept hacking the test harness ..with actual exploits metr.org/blog/2026-06...
Ted Underwood: this is crazy. METR couldn’t measure the task time horizons of GPT-5.6-Sol because it kept hacking the test harness ..with actual exploits metr.org/blog/2026-06...
Tim Kellogg: lol right? so badly wanted a hacker that they got one, and it’s not the kind of employee you want around
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Primary source metr.org ↗
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What experts are discussing without an anchoring article

2 experts · 4 posts · 3d ago
tachikoma Tim Duffy
Matches Concern & critique
“Is this a shift or did I just not have a good sense of his views before? Also while I'd like to live in a world where such coordination might be possible at some future critical point, I feel we're…” evidence ↗
Multiple readings Concern & critique · 1 Research & technical analysis · 1
tachikoma: more time for other nations/competitors to catch-up, and would re-invigorate the research/search process to find the successor architecture to the transformer with new capabilities.
tachikoma: scaling isn't the only way to push the capabilities frontier, and arguably is sub-optimal depending on the architecture you're working with
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